Op composite + build pipeline integration

[lex00]

Part of the Op / Temporal deployment workflow redesign.

Op is a new core composite in packages/core that declares a Temporal deployment workflow. Discovered via *.op.ts files; the Temporal lexicon serializer emits compiled workflow + worker JS to dist/ops/ as part of chant build.

Tasks

• Op type and factory in packages/core/src/op/types.ts
• phase(), activity(), gate() builder functions
• Pre-built activity library: build(), kubectlApply(), helmInstall(), waitForStack(), gitlabPipeline(), stateSnapshot(), shell(), gate(), teardown()
• RetryPolicy type and application logic
• Parallel phase support ({ parallel: true })
• depends enforcement (resolve Op dependency graph, block on incomplete deps)
• onFailure compensation phase
• Discovery of *.op.ts files in build pipeline
• Temporal lexicon serializer: emit compiled workflow + worker JS to dist/ops/
• Export Op and builders from packages/core index
• Tests